[Eeglablist] Filter causality pop_eegfiltnew

Vito de Feo vito.defeo at zmnh.uni-hamburg.de
Fri Jan 17 10:51:39 PST 2014


  Dear Gabriele,

the problem is not to remove the 50Hz in general but remove it before
Granger Causality analisys. In this case you need a causal filter. In the
other cases you can use the usual matlba routine.

Best,

Vito

Quoting Gabriele Trotta <trotta_gabriele at yahoo.com>:

> Dear Vito,
> in general, the 50Hz frequency can be removed by means of a Notch filter
> in the pre-processing stage. Matlab easily implement such a filter!
>     
>    http://www.mathworks.com/matlabcentral/newsreader/view_thread/292960
>
>
>                Il Venerdì 17 Gennaio 2014 5:24, robert coben
> <drcoben at gmail.com> ha scritto:
>                      Is Tim’s workshop available online?
>   
>          thx
>           
>          Rob
>
>                                  On Jan 15, 2014, at 6:04 PM, Makoto
> Miyakoshi <mmiyakoshi at ucsd.edu> wrote:
>
>> Dear Vito,                             
>>               > the acausal filtering destroy the causality flow. For
>> Granger it is important to use only causal filter.
>>                
>>               Oh really. That sounds counterintuitive to me. Please
>> send me the URL to the paper about it.
>>                
>>               However let me tell you this that Tim Mullen (the author
>> of SIFT) told us in the past EEGLAB workshop that we should not use ANY
>> filter for SIFT. If you want to remove low-frequency drifts etc... he
>> recommended the detrend option supported in SIFT. For low-pass filter,
>> he said don't use it. Also make sure that you use double precision, not
>> signle precision; check EEGLAB option to switch it (default should be
>> single precision). Actually these were new things I learned!
>>                
>>               Condro, for clarification to novice users, let me add
>> this that EEGLAB's FIR filter is by default non-causal (i.e. peak
>> latencies do not shift).
>>                
>>               Makoto
>>
>>                2014/1/15 Vito de Feo <vito.defeo at zmnh.uni-hamburg.de>
>>
>>> _Dear Makoto,
>>>
>>> the acausal filtering destroy the causality flow. For Granger it is
>>> important to use only causal filter. If you are interested I can send
>>> you a paper about that.
>>>
>>> Yes, I know SIFT and I am also using it for my analisys._
>>>
>>>
>>> _Vito
>>>
>>> Quoting Makoto Miyakoshi <mmiyakoshi at ucsd.edu>:_
>>>                    
>>>
>>>> _Dear Andreas and Vito, _
_ _
>>>>                       _Sorry Andreas I screwed it when I typed your
>>>> name._
>>>>                       _ _
>>>>                       _Vito, I would like to learn from you the
>>>> reason why you want to use the minimum phase filter for Granger
>>>> causality analysis. By the way, you know SIFT is available for it? In
>>>> case you don't know it yet, check
out http://sccn.ucsd.edu/wiki/SIFT._
>>>>                       _ _
>>>>                       _Makoto_
>>>>
>>>>
>>>>
>>>>                       _2014/1/14 Vito de Feo
>>>> <vito.defeo at zmnh.uni-hamburg.de>_
>>>>
>>>>> _Dear Andreas,
>>>>>
>>>>> I download the last version (13.1.1) and now the option is present
>>>>> and it is clearly written that the default is the zero-phase linear
>>>>> filtering.
>>>>>
>>>>> In my previous version (the last of the EEGLAB 12) this option was
>>>>> not present but now, with the version 13, it is present again!
>>>>>
>>>>> Best,
>>>>>
>>>>> Vito _
>>>>>
>>>>> _Quoting Andreas Widmann <widmann at uni-leipzig.de>:_
>>>>>
>>>>>> _Dear Vito,_
>>>>>>
>>>>>>> _in the last eeglab version there is not the minphase parameter in
>>>>>>> the pop_eegfiltnew function._
>>>>>>
>>>>>> _Which version is your last version? In 13.1.1 from the web page
>>>>>> and in rev 10261 from SVN the option is present. It was initially
>>>>>> introduced in EEGLAB 13 (but not backported to EEGLAB 12). Could
>>>>>> you please check whether possibly something went wrong with your
>>>>>> setup/path and report back your version number?_
>>>>>>
>>>>>>> _It was useful to force the filter to be causal. If I have
>>>>>>> understand well now the filter is causal by dafault because it
>>>>>>> uses the filter funcion. Is this correct?_
>>>>>>
>>>>>> _NO! Causal non-linear filter is NOT the default. Default is and
>>>>>> will remain zero-phase linear filtering. Default filter functions
>>>>>> did not change since EEGLAB 12.
>>>>>>
>>>>>> Best,
>>>>>> Andreas_
>>>>>>
>>>>>>> _Sorry if this is a vey well known issue but I didn't find any
>>>>>>> answer on the web until now.
>>>>>>> I need filter causality for Granger analisys. If anyone has also
>>>>>>> other suggestion about causal filtering with eeglab, any
>>>>>>> suggestion is very welcome!
>>>>>>>
>>>>>>> Thank in advange!
>>>>>>>
>>>>>>> Vito
>>>>>>>
>>>>>>> --
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und
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>>>>>>> Universitätsklinikum Hamburg-Eppendorf
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>>>>>>>
>>>>>>> Vorstandsmitglieder:
>>>>>>> Prof. Dr. Christian Gerloff (Vertreter des Vorsitzenden)
>>>>>>> Prof. Dr. Dr. Uwe Koch-Gromus
>>>>>>> Joachim Prölß
>>>>>>> Rainer Schoppik
>>>>>>>
>>>>>>> ________________________________________________
>>>>>>> Eeglablist page: http://sccn.ucsd.edu/eeglab/_eeglabmail.html_
>>>>>>> _To unsubscribe, send an empty email to
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>>>>>>>
>>>>>>> _--
>>>>>>> Makoto Miyakoshi
>>>>>>> Swartz Center for Computational Neuroscience
>>>>>>> Institute for Neural Computation, University of California San
Diego
>>>>>>> ________________________________________________
>>>>>>> Eeglablist page: http://sccn.ucsd.edu/eeglab/_eeglabmail.html_
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>>>>>
>>>>> __--
>>>>> Pflichtangaben gemäß Gesetz über elektronische Handelsregister und
>>>>> Genossenschaftsregister sowie das Unternehmensregister (EHUG):
>>>>>
>>>>> Universitätsklinikum Hamburg-Eppendorf
>>>>> Körperschaft des öffentlichen Rechts
>>>>> Gerichtsstand: Hamburg
>>>>>
>>>>> Vorstandsmitglieder:
>>>>> Prof. Dr. Christian Gerloff (Vertreter des Vorsitzenden)
>>>>> Prof. Dr. Dr. Uwe Koch-Gromus
>>>>> Joachim Prölß
>>>>> Rainer Schoppik__
>>>>
>>>>                       _ _
>>>> __-- __
>>>>                       __Makoto Miyakoshi
>>>> Swartz Center for Computational Neuroscience
>>>> Institute for Neural Computation, University of California San Diego__
>>>
>>> _--
>>> Pflichtangaben gemäß Gesetz über elektronische Handelsregister und
>>> Genossenschaftsregister sowie das Unternehmensregister (EHUG):
>>>
>>> Universitätsklinikum Hamburg-Eppendorf
>>> Körperschaft des öffentlichen Rechts
>>> Gerichtsstand: Hamburg
>>>
>>> Vorstandsmitglieder:
>>> Prof. Dr. Christian Gerloff (Vertreter des Vorsitzenden)
>>> Prof. Dr. Dr. Uwe Koch-Gromus
>>> Joachim Prölß
>>> Rainer Schoppik_
>>
>>                 
>> --
>>                Makoto Miyakoshi
>> Swartz Center for Computational Neuroscience
>> Institute for Neural Computation, University of California San Diego
>>
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>  



-- 
Pflichtangaben gemäß Gesetz über elektronische Handelsregister und Genossenschaftsregister sowie das Unternehmensregister (EHUG):

Universitätsklinikum Hamburg-Eppendorf
Körperschaft des öffentlichen Rechts
Gerichtsstand: Hamburg

Vorstandsmitglieder:
Prof. Dr. Christian Gerloff (Vertreter des Vorsitzenden)
Prof. Dr. Dr. Uwe Koch-Gromus
Joachim Prölß
Rainer Schoppik
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